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whats up with 4.9 is it lagging or just not what you want....ive owned 3 in my lifetime and been some tuff as- motors .. its a 300 cubic inch motor with more torque then 5.0 302 if you truely want to change it go craigslist and look for a cheap truck and go from there
Before you bother swapping over the motors, you really need to look at what you use the truck for. The 4.9L is a hoss of a motor. I love mine for rock crawling, and a enough torque to pull over a house. Its just not a go fast for cheap motor.
Definately wouldnt bother with a 302. the 351 will be a little harder to find but would be worth the extra 49 cubes. Just make sure to get all the parts you will need off a donor vehicle and if you can have complete donor vehicle that would be better. Tranny bolts right up. Small block conversion is alot easier than bigblock.